Research - If pluginbases from 2852463 can use mergeDeepArray

Problem/Motivation

From @mdlutz

It's an issue of overriding it and keeping tests, or resetting it to the standard and adjusting all the tests to handle the reordered returned array. I also removed use of the trait entirely from ConditionPluginBase for the same reasons, updating it to use mergeDeepArray broke a few tests and will require adjusting the order of items in umami config to pass tests (as they would be exported in a different order, causing a test fail) It's better to explore converting both of those pluginbases to use mergeDeepArray in a followup, if at all, where we can review the test changes and potential BC issues more thoroughly in isolation from the trait and base class work being provided here.

Steps to reproduce

NA

Proposed resolution

TBD

Remaining tasks

Determine if worth it first

User interface changes

NA

Introduced terminology

NA

API changes

NA

Data model changes

NA

Release notes snippet

NA